diff --git a/c05_expression/post_pre.c b/c05_expression/post_pre.c
new file mode 100644
index 0000000..d5cd1c3
--- /dev/null
+++ b/c05_expression/post_pre.c
@@ -0,0 +1,15 @@
+/* post_pre.c - 前缀和后缀 */
+#include <stdio.h>
+
+int main(void)
+{
+    int a = 1, b = 1;
+    int a_post, pre_b;
+
+    a_post = a++;
+    pre_b = ++b;
+    printf("a\ta_post\tb\tpre_b\n");
+    printf("%d\t%d\t%d\t%d\n", a, a_post, b, pre_b);
+
+    return 0;
+}
\ No newline at end of file